Nedbank closed my account for no reason.

My debit card was expiring end 11/2018. Until the last week in November calls to the Gateway branch told me that no card had arrived for me. I eventually got hold of the card division who ordered a card for me and had it sent to the Gateway branch. I went to the branch on Thursday 29 November to collect my new card and all was well. The new card was used both in store and online over the weekend of 1 and 2 December but on 3 December the card could no longer be used online. I called the ********** 111 number to find out what was going on and was told that my card and account had been closed because the Go Banking accounts were being discontinued and I would have to go back to the branch to get another new card. Why was this not communicated to me when I was in the branch 5 days before collecting my new Go Banking card? I will NOT be going back to the branch. I will NOT be collecting another new card. Why must I waste my time and money to correct a mistake you made?